What's wrong with my leopard gecko..

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Hello guys, I've been viewing a lot of topics from this forums recently after buying my first leopard gecko but this will be my first post as a new member of this community.

I just bought this leopard gecko about a week and a half ago, when I got him he seemed okay. The breeder whom I got the gecko from said he's 5 months old, his tail is not too fat nor too thin and toes are all complete when I checked it before buying. I feed him mainly with mealworms & crickets (but mostly mealworms). Now, my concern is when I got the gecko home after buying, I let him walk around his new enclosure (I use paper towel as substrate) I noticed that he is bit lethargic, I thought it may be due to stress as he's been in a small container for about an hour on the way home. I observed him after few days when I had the chance (I stayed up late waiting for him to go out of his hide). He can walk perfectly normal but when he bumps onto something he kind of stumbles and there's this moment when I had to clean the enclosure so I put him into a tub with paper towel that he can walk on, I saw him lifting his head up (observing the new environment?) but after a few seconds he would drop his head on the ground as his arms can't seem support him doing that, whenever he lifts his head same thing would happen. I've read an article about Metabolic Bone Disease, I saw what would be the symptoms etc. etc., and I think that's not the case because my gecko can lift his body up and not having to drag his belly when walking. What concerns me is this enigma syndrome I've also read what about it, My gecko though, can catch prey with no problem like at all and I don't have to feed him with forceps/hand, he can get the worms out of his bowl. I also did put crickets in his enclosure one time and he was able to catch all of them 5. Does this have to concern me? Is there any symptoms of him having any of the said diseases after all? Does he lack in calcium? or is it just because he's still juvenile?

ps. sorry for the long read I just want the best for my new gecko any answers regarding this will be greatly appreciated! thank you!!

Please share a video of your leo walking around and bumping into stuff.

What type of supplements have you now: calcium carbonate, calcium with D3, multivitamins? Which brand?

Thank you!

I will post a vid of him walking around later if I have a chance (he's sleeping)
For now, I have a pure calcium and calcium with D3. I have a bottle cap filled with pure calcium only placed inside his vivarium and I dust the one with D3 on his food every other day. I am planning to get one with multivitamins as well though.
Can I ask what are the common/main symptoms of a leopard gecko having enigma syndrome?
Thanks again!

I will post a vid of him walking around later if I have a chance (he's sleeping)
For now, I have a pure calcium and calcium with D3. I have a bottle cap filled with pure calcium only placed inside his vivarium and I dust the one with D3 on his food every other day. I am planning to get one with multivitamins as well though.
Can I ask what are the common/main symptoms of a leopard gecko having enigma syndrome?
Thanks again!

You're welcome. What brand of calcium with D3? What brands of multivitamins can you order/get?

D3 is a fat soluble vitamin. It sticks around in a leo's body and only needs to be lightly dusted on feeders 1x per week.